单项选择题

The risk of dying from cancer in developed countries is

A．double that in developing countries.
B．much higher than that in developing countries.
C．the same as that in developing countries.
D．much lower than that in developing countries.

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单项选择题

Which of the following is NOT true of Crystal Ear

A．It is highly sensitive.
B．It is powerful.
C．It is invisible.
D．It is wireless.

单项选择题

According to the passage, hearing loss is

A．only a minor health problem.
B．the world's most common health problem.
C．merely a teenage disease,
D．an incurable disease.